/*
 * Copyright 2012 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.fieldscope.api;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

/**
 * Utilities for converting between time formats.
 *
 * @author Travis Keep
 */
class TimeUtils {
  private TimeUtils() {
  }
  
  public static long parseJSONDate(String s) throws ParseException {
    return createJSONDateFormat().parse(s).getTime();
  }
  
  public static String formatPostTime(long time) {
    
    // TODO(rocketman): Be sure that field scope is expecting time in
    // GMT instead of local time of field scope server which is Eastern time.
    return createPostDateFormat().format(new Date(time));
  }
  
  private static DateFormat createJSONDateFormat() {
    DateFormat result = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
    result.setTimeZone(TimeZone.getTimeZone("UTC"));
    return result;
  }
  
  private static DateFormat createPostDateFormat() {
    DateFormat result = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    result.setTimeZone(TimeZone.getTimeZone("UTC"));
    return result;
  }
}
